如何在C＃中使用多个单选按钮？

Question

How can I use multiple radio buttons and save to my database access the select item text radio button he save only the gender when I try only from name to gender.when i try query insert into (lname, mname, fname, course, major, minor, gender) he save the data in my database access when I try the year with another radio buttons insert into (lname, mname, fname, course, major, minor, gender, year) he error to the insert into but he save the text when I leave the text in the string year.

Design of my form:

public partial class student : UserControl
{
    OleDbConnection con = new OleDbConnection(@"Provider = 
    Microsoft.ACE.OLEDB.12.0; Data Source 
    =C:\Users\ronaldcaymo\Desktop\Student Information System.accdb");
    string Gender;
    string year;
    string Status;

    private void button4_Click(object sender, EventArgs e)
    {
        con.Open();
        OleDbCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "insert into 
        table1(Lname,Fname,Mname,Course,Major,Minor,semester,Gender,Status) 
        values('"+tblname.Text+"','"+tbfname.Text+"','"+tbmname.Text+ 
        "','"+cbcourse.Text+"','" +cbmajor.Text 
  +"','"+cbminor.Text+"','"+cbsemester.Text+"','"+Gender+"','"+Status+"')";
        cmd.ExecuteNonQuery();
        con.Close();
        MessageBox.Show("Student Added");
    }    
    private void radioButton5_CheckedChanged(object sender, EventArgs e)
    {
        Gender = "Male";
    }

    private void radioButton6_CheckedChanged(object sender, EventArgs e)
    {
        Gender ="Female";
    }

    private void radioButton1_CheckedChanged(object sender, EventArgs e)
    {
        year = "1st";
    }

    private void radioButton2_CheckedChanged(object sender, EventArgs e)
    {
        year ="2nd";
    }

    private void radioButton3_CheckedChanged(object sender, EventArgs e)
    {
        year ="3rd";
    }

    private void radioButton4_CheckedChanged(object sender, EventArgs e)
    {
        year ="4th";
    }

    private void radioButton8_CheckedChanged(object sender, EventArgs e)
    {
        Status = "Single";
    }

    private void radioButton7_CheckedChanged(object sender, EventArgs e)
    {
        Status = "Married";
    }  

}

Answer 1

The CheckedChanged event of your radio buttons will trigger everytime your radio button's status is changed, that means when it's checked or unchecked.

So when '1st year' is checked and you check another radio button such as '3rd year', '1st year' will become unchecked and thus trigger the event radioButton1_CheckedChanged at the same time with radioButton3_CheckedChanged .

To fix this issue, add a condition check inside all your radioButton_CheckedChanged events as such:

private void radioButton3_CheckedChanged(object sender, EventArgs e)
{
    if(radioButton3.Checked){
        year ="3rd";
    }
}